Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 114, Issue 2, Pages 239-244Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1606798114
Keywords
domoic acid; Pacific Decadal Oscillation; El Nino; Northern California Current; Pseudo-nitzschia
Categories
Funding
- NOAA from the Monitoring and Event Response for Harmful Algal Blooms (MERHAB) program [NA07NOS4780195]
- National Science Foundation [1459480-OCE]
- Division Of Ocean Sciences
- Directorate For Geosciences [1459480] Funding Source: National Science Foundation
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Domoic acid is a potent neurotoxin produced by certain marine microalgae that can accumulate in the foodweb, posing a health threat to human seafood consumers and wildlife in coastal regions worldwide. Evidence of climatic regulation of domoic acid in shellfish over the past 20 y in the Northern California Current regime is shown. The timing of elevated domoic acid is strongly related to warm phases of the Pacific Decadal Oscillation and the Oceanic Nino Index, an indicator of El Nino events. Ocean conditions in the northeast Pacific that are associated with warm phases of these indices, including changes in prevailing currents and advection of anomalously warm water masses onto the continental shelf, are hypothesized to contribute to increases in this toxin. We present an applied domoic acid risk assessment model for the US West Coast based on combined climatic and local variables. Evidence of regional-to basin-scale controls on domoic acid has not previously been presented. Our findings have implications in coastal zones worldwide that are affected by this toxin and are particularly relevant given the increased frequency of anomalously warm ocean conditions.
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